Reducing the resistance for the use of electrochemical impedance spectroscopy analysis in materials chemistry

Abstract

This manuscript highlights a beginner-to-intermediate level scope of electrochemical impedance spectroscopy (EIS), which is an indispensable, non-destructive electrochemical technique that can be applied for materials characterization.

Electrochemical Impedance Spectroscopy in the Characterisation and Application of Modified Electrodes for Electrochemical Sensors and Biosensors

“…Electrochemical impedance spectroscopy is a valuable electrochemical technique for characterisation of electrochemical systems and materials, which includes the characterisation of electrodes and modified electrodes. Some resistance to its use, as recently explicitly pointed out [ 36 ], is probably due mainly to a lack of knowledge of the basic principles of ac electrical circuits, that are used to represent the charge separation and charge transfer phenomena in the interfacial region on electrode surfaces. This is one of the main challenges for more widespread use of EIS in the future.…”

Sensitive immunosensing of α-synuclein protein in human plasma samples using gold nanoparticles conjugated with graphene: an innovative immuno-platform towards early stage identification of Parkinson's disease using point of care (POC) analysis

“…Each point on the plot represents a different frequency. 56 As can be seen in Fig. 6C , the Nyquist plot is overlaid with a curved arrow showing the direction of the frequency progression.…”

Supercapacitor based on polymeric binary composite of polythiophene and single-walled carbon nanotubes

“…The capacitor response frequency ( f 0 ) is characterized as the position of equal resistive and capacitive, and the relaxation time constant (τ 0 ) is defined as the minimum time for discharging the energy from the supercapacitor. The value of f 0 is obtained from the Bode phase angle plots at the position of 45° and τ 0 is calculated using the formula of τ 0 = 1/ f 0 10 , 53 . The relaxation time constant represents the transition from pure resistive to pure capacitive behavior for the electrochemical capacitor.…”